Ignore:
Timestamp:
Jan 26, 2021 12:48:52 PM (12 months ago)
Author:
toby
Message:

wx4.1 updates; new CIF data item; scripting: peak fit details returned; improve multistring gui

File:
1 edited

Legend:

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  • trunk/help/gsasII.html

    r4682 r4783  
    65226522  X-ray/CW-neutron refinement of PbSO4 tutorial</a>.
    65236523
    6524 <dt><B>Preferred orientation</B><dd> is treated in one of two
     6524<dt><a name="Preferred_orientation">
     6525  <B>Preferred orientation</B></a>
     6526<dd> is treated in one of two
    65256527  ways. Intensity corrections can be added to the model here or a full
    65266528  texture model is possible with the "texture" tab (which usually
     
    72497251
    72507252<h4 style='margin-left:0.25in'><a name="Texture">Texture </a></h4>
     7253<p class=MsoNormal style='margin-left:.5in'>
     7254This tab is used to control settings used for a texture (pole figure)
     7255study of a material. This type of characterization requires
     7256diffraction data recorded with multiple detector orientations (the
     7257number of orientations will depend on sample and material
     7258symmetry). Do not confuse this with applying a
     7259<a href="#Preferred_orientation">preferred orientation correction</a>
     7260(found in the <a href="#Data">"Data" tab</A>) in a structural study. The sample
     7261orientation relative to the detector axes is specified here and the
     7262detector orientation is specified for each histogram as goniometer
     7263omega, chi, phi and azimuth values. These values must be specified.
     7264</P>
     7265<p class=MsoNormal style='margin-left:.5in'>
     7266Texture is modeled for different types of sample treatment, where grain
     7267orientation can have symmetry: cylindrical, rolling, shear or none
     7268(ordered from highest to lowest).
     7269The number of spherical harmonics coefficients is determined by the
     7270harmonic order and the symmetry setting.
     7271</P>
    72517272
    72527273<h5 style='margin-left:.5in'><span><span
     
    72547275class=MsoHyperlink><span style='color:#4F4FFF;text-decoration:none;text-underline:
    72557276none'><o:p></o:p></span></span></span></span></h5>
     7277<p class=MsoNormal style='margin-left:0.75in'>
     7278The refined texture coefficients can be plotted in different ways:
     7279<UL style='margin-left:1.0in'>
     7280  <LI>
     7281as an "Axial pole
     7282distribution" which simulates the intensity of a reflection during a
     7283  phi scan.
     7284  <LI>as a "pole figure" or "inverse pole figure"
     7285  which shows the intensity of a reflection as
     7286  a function of sample orientation
     7287  <LI>as a "3D pole distribution" that shows the probability of
     7288  finding a crystallite with a given orientation.
     7289</UL>
     7290</P> 
     7291
     7292
    72567293
    72577294<h4 style='margin-left:0.25in'><a name="Map_peaks">Map peaks</a></h4>
     
    75037540<hr size=2 width="100%" align=center>
    75047541
    7505 <!-- hhmts start -->Last modified: Thu Dec 10 19:31:56 CST 2020 <!-- hhmts end -->
     7542<!-- hhmts start -->Last modified: Tue Jan 26 12:36:18 CST 2021 <!-- hhmts end -->
    75067543
    75077544</div>
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